CN104897378A - Swing fatigue test device - Google Patents
Swing fatigue test device Download PDFInfo
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- CN104897378A CN104897378A CN201410692212.0A CN201410692212A CN104897378A CN 104897378 A CN104897378 A CN 104897378A CN 201410692212 A CN201410692212 A CN 201410692212A CN 104897378 A CN104897378 A CN 104897378A
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Abstract
The invention discloses a swing fatigue test device. The swing fatigue test device comprises a test piece loading mechanism used for fixing a test piece, a counterweight used for simulating a load which is vertically downward all the time, a flexible connection part whose upper and lower ends are fixedly connected with the test piece and the counterweight respectively, a drive mechanism used for outputting reciprocal rectilinear motions, a rotation amplifying mechanism used for converting the reciprocal rectilinear motions outputted by the drive mechanism into pendulum motions and carrying out amplification, a transmission mechanism used for transmitting the pendulum motions outputted by the rotation amplifying mechanism and driving the flexible connection part to carry out rocking motions so as to drive the test piece to carry out reciprocal rocking motions, and a restraint mechanism used for restraining the rocking motions which are transmitted by the flexible connection part to the counterweight into up and down motions. The swing fatigue test device has the characteristics of simple structure, low cost and convenient installation and the like and is capable of enabling a load to be more stable in rapid swinging in a process of a swing test and thus a phenomenon of destroying the test piece does not happen.
Description
Technical field
The present invention be more particularly directed to a kind of swing fatigue rig, mainly apply to heavier loads, pendulum angle is large, hunting frequency is on the low side, in the torture test of long operational time, in order to complete the fatigue behaviour of examination product.
Background technology
In the common carriage such as high ferro, bus, suspension ring are installed or other armrest members use for passenger, the applying working condition of suspension ring is: its top ends is fixed on the horizontal support of top in car body, its bottom is the adhesive tape gripped for passenger, and in body movement process, suspension ring can produce swing, maximum hunting frequency can be 1Hz, pendulum angle is generally within ± 30 °, and suspension ring can bear the human body weight of part simultaneously, are approximately 25kg, direction power vertically downward.Can request for utilization be met in order to ensure suspension ring in life cycle, need to carry out torture test to test its reliability, thus ensure the personal safety of passenger.
Traditional test unit mainly comprises support, driving mechanism, tilting mechanism, described driving mechanism outputting reciprocating linear movement, and be flexibly connected with described tilting mechanism, by described tilting mechanism, linear reciprocating motion is converted to oscillating motion, at the trial, the test specimen be fixed on test stand is connected with tilting mechanism.Because test specimen exists load vertically downward in its actual application, thus in test need connect test specimen with a counterweight and simulate replacement load, right weight mass is concentrated, so that when swinging fast, larger inertia can be produced, unnecessary destruction is produced to test specimen.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of simple and reasonable swing fatigue experimental device, it is while realizing product swing test, makes load more steady under swinging fast, there will not be the phenomenon destroying test specimen.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of swing fatigue experimental device, comprising:
Test specimen load carrier, in order to fixing test specimen;
Counterweight, in order to simulation load vertically downward all the time;
Flexible connecting member, upper and lower end is fixedly connected with counterweight with described test specimen respectively;
Driving mechanism, in order to outputting reciprocating linear movement;
Rotate enlarger, the linear reciprocating motion in order to be exported by described driving mechanism is converted to oscillating motion and amplifies;
Gear train, in order to transmit the oscillating motion that described rotation enlarger exports, and orders about described flexible connecting member and carries out oscillating motion, and then drive test specimen to carry out reciprocating swing motion;
Constraint mechanism, moves up and down in order to the oscillating motion being passed to counterweight by flexible connecting member to be constrained to.
Further, described test specimen load carrier comprises a cylinder, and described cylinder two ends are fixedly connected with rigid support, and described test specimen is fixed on described cylinder.
Such as, described cylinder is connected on rigid support by rigid connectors such as flanges.
Further, described rigid support can have framed structure, and can be fixedly connected to form primarily of H profile steel and 45 steel.
Further, described driving mechanism can be selected but be not limited to telescoping drive mechanism, such as, and Pneumatic extension driving mechanism, hydraulically extensible driving mechanism, electrostriction driving mechanism or magnetostriction driving mechanism.
Further, described driving mechanism comprises and is fixedly installed on cylinder on pedestal and cylinder control unit.
Wherein, described cylinder control unit can adopt PLC, MCU or computer system etc., the running parameters such as the stroke of the linear reciprocating motion that nationality exports with control cylinder and frequency.
Further, described rotation enlarger comprises swing arm, and described swing arm bottom one bearing is connected with pedestal is rotating, is also in transmission connection with described driving mechanism simultaneously, and described swing arm top and described gear train are in transmission connection.
Further, the movable end of described driving mechanism loads axle by a locking card extender and and is connected, described loading axle inserts in the waist-shaped hole in described swing arm, and described loading axle and described waist-shaped hole clearance fit, described locking card extender is also provided with ball more than two, described ball is all fitted with described swing arm simultaneously.
Further, described gear train comprises at least one pair of live roller, and two live rollers in every a pair live roller intercouple, and described flexible connecting member passes between these two live rollers.
Further, described constraint mechanism comprises at least one pair of constraint roller, and two constraint rollers in every a pair constraint roller intercouple, and described flexible connecting member passes between these two constraint rollers.
Preferably, for avoiding the motion amplitude of flexible connecting member in gear train or constraint mechanism excessive, the gap length between two live rollers or two constraint rollers can be controlled in the range of size that the diameter with flexible connecting member is substantially equal.
Further, when described swing fatigue experimental device is in suspended state, the center of described test specimen, counterweight, flexible connecting member, gear train and constraint mechanism is on a vertical curve.
Further, described flexible connecting member can adopt the flexible connecting member with some strength and toughness, such as wire rope etc., and is not limited thereto.
By previous designs, make the present invention compared to prior art at least tool have the following advantages:
(1) swing fatigue experimental device structure provided by the invention is simple, cost is low, is easy to installation and maintenance;
(2) the present invention adopts driving mechanism to promote to rotate enlarger with little stroke linear reciprocating motion, rotation enlarger is made to carry out reciprocating swing motion, flexible connecting member is driven to carry out oscillating motion by gear train again, finally realize the reciprocating swing motion of test specimen, implement simple and convenient, cost is low, stable and reliable for performance, and the stroke of the linear reciprocating motion that can be exported by free adjustment driving mechanism and frequency, thus different Test Condition Requirements can be met;
(3) the present invention promotes flexible connecting member by adopting the roller intercoupled as gear train, significantly reduces the friction of internal system, improves the response speed of system, and the rotation of rotating enlarger is effectively delivered on flexible connecting member;
(4) the present invention simulates load vertically downward all the time by adopting counterweight, and adopts idler wheel mechanism counterweight to be constrained to by vacillating now to the left, now to the right to move up and down, and make load more steady under swinging fast, the inertia avoiding counterweight larger is to the overtesting of test specimen.
Accompanying drawing explanation
In order to be illustrated more clearly in architectural feature of the present invention and technical essential, below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Fig. 1 is a kind of front view swinging fatigue experimental device in the present invention one exemplary embodiments;
Fig. 2 is a kind of front view swinging fatigue experimental device (except holder part) in the present invention one exemplary embodiments;
Fig. 3 is for looking schematic diagram in a left side for the swing fatigue experimental device (except holder part) disclosed in the embodiment of the present invention;
Fig. 4 is the amplification principle schematic diagram of the swing fatigue experimental device disclosed in the embodiment of the present invention.
Description of reference numerals: 11-support, 12-cylinder, the locking card extender of 13-, 14-loads axle, 15-swing arm, 15a-waist-shaped hole, 16-live roller, and 17-retrains roller, 18-flexible connecting member, 19-counterweight, 20-bearing, 21-cylinder, 22-test specimen.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be described in detail the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Shown in Fig. 1-4, this swing fatigue experimental device comprises support 11, driving mechanism, rotation enlarger, gear train and constraint mechanism etc., wherein driving mechanism and rotation enlarger are between pair of brackets 11, support 11 is fixed on ground, driving mechanism is in order to outputting reciprocating linear movement, and be in transmission connection with rotation enlarger, rotate enlarger and be converted to oscillating motion in order to the linear reciprocating motion exported by driving mechanism, and realize the amplification of stroke.Gear train comprises the live roller 16 intercoupled for a pair, and the swing arm 15 of axostylus axostyle connection of rotating enlarger is passed through in one end of live roller 16.Constraint mechanism comprises the constraint roller 17 intercoupled for a pair, one end of constraint roller 17 is connected on support 11 by axostylus axostyle, the top ends of test specimen 22 is fixed on the cylinder 21 between two stands 11, its bottom has some strength by one and is connected a counterweight 19 with the flexible connecting member 18 of toughness, and flexible connecting member 18 is arranged between those live rollers 16 intercoupled and between the constraint roller 17 intercoupled.
Wherein, driving mechanism comprises and is fixedly arranged on cylinder 12 on ground and the control module for control cylinder 12 stroke and frequency, as PLC by flange.Concrete, the stroke of cylinder 12 is controlled by flow speed control valve, and frequency is controlled by PLC, and thrust is controlled by pressure valve, thus can within the specific limits, freely the stroke of adjusting cylinders 12 linear reciprocating motion and frequency.Preferred cylinder 12, converts its linear reciprocating motion to oscillating motion, and implement simple and convenient, cost is low.In addition, be free to stroke and the frequency of adjusting cylinders 12 linear reciprocating motion by control module, thus different Test Condition Requirements can be met.
Shown in Fig. 2-3, rotate enlarger and comprise and load axle 14 and swing arm 15, swing arm 15 bottom is connected through bearing 20 and pedestal are rotating, and swing arm 15 is that fulcrum swings with tie point.The bottom of swing arm 15 top position being positioned at tie point offers a vertical waist-shaped hole 15a, cylinder 12 connects through a locking card extender 13 and loads axle 14, loads the waist-shaped hole 15a clearance fit of axle 14 and swing arm 15, and is vertically inserted in waist-shaped hole 15a.Cylinder 12 is driven by locking card extender 13 and loads axle 14 linear reciprocating motion, load axle 14 again by with waist-shaped hole 15a coordinate oscillating traverse motion straight reciprocating motion being converted to swing arm 15.
Locking card extender 13 is provided with anti-rotation element, and anti-rotation element is two groups of balls, and ball and swing arm 15 fit, and overturns, thus cause force uneven to avoid loading axle 14 in waist-shaped hole 15a during reciprocatory movement.Flexible connecting member 18 is preferably steel cable.Cylinder 21 is rigidly connected between two stands 11 by flange, and support 11 is fixedly connected to form by H profile steel and 45 steel.
Below more by reference to the accompanying drawings 4, embodiments of the invention are further illustrated.
When designing the size of this swing fatigue experimental device, consult Fig. 4, if suppose, the length of known test specimen is L2, hunting frequency f, the angle b of swing, the range L4 of cylinder, the length L1 of swing arm, then:
The stroke that test specimen swings is L5=2 × L2 × sin (b);
Enlarger amplification coefficient is k=L5/L4
The pendulum angle of swing arm is a=arcsin (L1/ (L2 × sin (b)))
It is highly L3=L4/ (2 × tan (a)) that cylinder loads
The stroke of waist-shaped hole is minimum is L=L3/sin (a)-L3.
According to test demand, this swing fatigue experimental device is carried out installing the operation steps regulated and comprises:
1) according to the pendulum angle b of testing requirements, the length L2 of test specimen 22, calculate amplification coefficient k, the loading height L3 of cylinder 12, the minimum stroke L of waist-shaped hole 15a, thus design suitable rotation enlarger.
2) be fixed on ground by bolt by support 11, the head of test specimen 22 is fixed on the cylinder 21 of support 11, and the bottom of test specimen 22 connects counterweight 19 by wire rope.
3) end of cylinder 12 is fixed on ground by flange, its head connects loading axle 14 by locking card extender 13, loading axle 14 inserts in the waist-shaped hole 15a in swing arm 15, locking card extender 13 is arranged two groups of balls, ball and swing arm 15 are fitted, and swing arm 15 is articulated with the bearing 20 be fixed on ground.
4) by wire rope and live roller 16 with retrain roller 17 and coordinate, the center ensureing test specimen 22, wire rope, counterweight 19, live roller 16 and retrain roller 17 is on a vertical curve.
5) regulate the relative position of live roller 16 and constraint roller 17, to ensure not interfere in motion, and the initial position of swing arm 15 is adjusted to vertically.
6) according to the hunting frequency f of testing requirements, setting PLC program, and regulate pressure size and flow speed control valve aperture, open pneumatic means.
7) measure the pendulum angle of test specimen 22, contrast with required value: if be greater than required value, then reduce pressure or reduce flow speed control valve aperture; If be less than required value, then increase pressure or increase flow speed control valve aperture;
8) check that whether the motion of wire rope in live roller 16 and constraint roller 17 be smooth and easy, whether have wearing and tearing;
9) detect cylinder 12 stroke whether to change, back and forth whether symmetrical, if uneven because being subject to load disturbance, then need the flow speed control valve at adjusting cylinders 12 two ends to compensate.
10) finder is without exception after running 15 minutes, illustrates that device tends towards stability, and can regularly detect, and periodic maintenance loads axle 14 and wire rope, if wearing and tearing, changes in time.
In sum, swing fatigue experimental device of the present invention has that structure is simple, cost is low, the feature such as easy for installation, driving mechanism is adopted to promote to rotate enlarger with little stroke linear reciprocating motion, rotation enlarger is made to carry out reciprocating swing motion, drive flexible connecting member 18 to carry out oscillating motion by gear train again, finally realize the reciprocating swing motion of test specimen 22.In the process, gear train adopts the live roller 16 intercoupled to promote flexible connecting member 18, reduce the friction between drive system roller 16 and flexible connecting member 18 significantly, improve the response speed of test unit, and make the swing of swing arm 15 effectively be delivered on flexible connecting member 18; Adopt counterweight 19 to simulate load vertically downward all the time, and adopt constraint roller 17 counterweight 19 to be constrained to by vacillating now to the left, now to the right to move up and down, make load more steady under swinging fast, avoid the inertia because counterweight 19 is larger to cause unnecessary destruction to product.
Be to be understood that; above-mentioned embodiment is only and technical conceive of the present invention and architectural feature is described; object is to allow the stakeholder being familiar with technique implement according to this; but above said content does not limit the scope of the invention; every any equivalence done according to Spirit Essence of the present invention changes or modifies, and all should fall within protection scope of the present invention.
Claims (10)
1. swing a fatigue experimental device, it is characterized in that comprising:
Test specimen load carrier, in order to fixing test specimen;
Counterweight, in order to simulation load vertically downward all the time;
Flexible connecting member, its upper and lower end is fixedly connected with counterweight with described test specimen respectively;
Driving mechanism, in order to outputting reciprocating linear movement;
Rotate enlarger, the linear reciprocating motion in order to be exported by described driving mechanism is converted to oscillating motion and amplifies;
Gear train, in order to transmit the oscillating motion that described rotation enlarger exports, and orders about described flexible connecting member and carries out oscillating motion, and then drive test specimen to carry out reciprocating swing motion;
Constraint mechanism, moves up and down in order to the oscillating motion being passed to counterweight by flexible connecting member to be constrained to.
2. swing fatigue experimental device according to claim 1, it is characterized in that described test specimen load carrier comprises a cylinder, described cylinder two ends are fixedly connected with rigid support, and described test specimen is fixed on described cylinder.
3. swing fatigue experimental device according to claim 1, it is characterized in that described driving mechanism comprises telescoping drive mechanism, described telescoping drive mechanism comprises Pneumatic extension driving mechanism, hydraulically extensible driving mechanism, electrostriction driving mechanism or magnetostriction driving mechanism.
4. the swing fatigue experimental device according to claim 1 or 3, is characterized in that described driving mechanism comprises and is fixedly installed on cylinder on pedestal and cylinder control unit.
5. swing fatigue experimental device according to claim 1, it is characterized in that described rotation enlarger comprises swing arm, described swing arm bottom one bearing is connected with pedestal is rotating, is also in transmission connection with described driving mechanism simultaneously, and described swing arm top and described gear train are in transmission connection.
6. swing fatigue experimental device according to claim 5, it is characterized in that the movable end of described driving mechanism loads axle by a locking card extender and and is connected, described loading axle inserts in the waist-shaped hole in described swing arm, and described loading axle and described waist-shaped hole clearance fit, described locking card extender is also provided with ball more than two, described ball is all fitted with described swing arm simultaneously.
7. the swing fatigue experimental device according to any one of claim 1-3,5-6, it is characterized in that described gear train comprises at least one pair of live roller be connected with rotation enlarger, two live rollers in every a pair live roller intercouple, and described flexible connecting member passes between these two live rollers.
8. the swing fatigue experimental device according to any one of claim 1-3,5-6, it is characterized in that described constraint mechanism comprises at least one pair of that be fixedly connected with support and retrains roller, two constraint rollers in every a pair constraint roller intercouple, and described flexible connecting member passes between these two constraint rollers.
9. the swing fatigue experimental device according to any one of claim 1-3,5-6, it is characterized in that, when described swing fatigue experimental device is in suspended state, the center of described test specimen, counterweight, flexible connecting member, gear train and constraint mechanism is on a vertical curve.
10. the swing fatigue experimental device according to any one of claim 1-3,5-6, is characterized in that described flexible connecting member adopts wire rope.
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| CN201410692212.0A CN104897378B (en) | 2014-11-26 | 2014-11-26 | Swing fatigue experimental device |
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Cited By (5)
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| CN106092572A (en) * | 2016-08-30 | 2016-11-09 | 江苏太元智音信息技术股份有限公司 | A kind of rotary motion blockage detection mechanism of straight line sub-control |
| CN106289743A (en) * | 2016-08-04 | 2017-01-04 | 南通市通润汽车零部件有限公司 | A kind of detecting system of Automotive Drawbar |
| CN109443816A (en) * | 2018-11-23 | 2019-03-08 | 东莞市安磁检测技术有限公司 | A kind of swing type electronic product performance testing stand |
| CN111301388A (en) * | 2020-02-28 | 2020-06-19 | 中车齐齐哈尔车辆有限公司 | Test device of brake pipe protection component |
| CN111879697A (en) * | 2020-06-08 | 2020-11-03 | 中交二公局第二工程有限公司 | Swing type test saddle assembly |
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| CN111301388A (en) * | 2020-02-28 | 2020-06-19 | 中车齐齐哈尔车辆有限公司 | Test device of brake pipe protection component |
| CN111879697A (en) * | 2020-06-08 | 2020-11-03 | 中交二公局第二工程有限公司 | Swing type test saddle assembly |
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